What is bonded concrete overlay?

What is bonded concrete overlay?

A bonded concrete overlay (BCO) consists of a new concrete overlay placed directly on top of an existing concrete pavement. The overlay bonds to the existing concrete to create a monolithic slab.

What is PCC surfacing?

CONCRETE PAVEMENT. Application Description. INTRODUCTION. Portland cement concrete (PCC) pavements (or rigid pavements) consist of a PCC slab that is usually supported by a granular or stabilized base, and a subbase. In some cases the PCC slab may be overlaid with a layer of asphalt concrete.

What is the difference between bonded and unbonded concrete?

Light and flexible, unbonded mono strand can be easily and rapidly installed – providing an economical solution. Bonded Post-Tensioning comprises tendons from one to multiple strands (multistrand) or bars. For bonded systems, the prestressing steel is encased in a corrugated metal or plastic duct.

How thin can a concrete overlay be?

Concrete overlays less than 6 inches (152 mm) thick are commonly identified as “thin” concrete overlays, while the term “ultra thin” is sometimes used to refer to overlays less than 4 inches (102 mm) thick. These thin overlays also feature smaller slab sizes, with 6 ft by 6 ft (1.8 by 1.8 m) panels commonly used.

What is bonded concrete?

Definition: (1) adhesion of concrete or mortar to reinforcement or other surfaces against which it is placed, including friction and mechanical interlock; (2) adhesion of cement paste to aggregate; (3) adhesion, cohesion, or both between materials; (4) patterns formed by the exposed faces of masonry units, for example.

What is PCC base?

Portland cement concrete (PCC) was originally used as a base and was surfaced with wooden blocks, bricks, and cobblestones. The primary benefit of using PCC was its ability to spread load over a larger area than granular or bituminous bound materials, thereby allowing road builders to use less aggregate material.

What is the difference between bonded and unbonded strain gauges?

The essential difference is that the bonded strain gauges are bonded on to the specimen whose strain is being measured whereas the unbonded strain gauges are not bonded on to the specimen. However, the bonded strain gauges are affected by temperature changes and also due to transverse strains.